Water-tube boiler



F. KROPELIN WATER TUBE BOILER Filed Sept. '7, 1927 March 17, 1931.

3 Sheets-Sheet l March 17, 1931. F. KROPELIN 1,796,604

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kmPa M Patented Mar. 17, 1931 UNHTED STATES PATENT OFFICE WATER-TUBE BOILER Application filed September 7, 1927, Serial No. 218,056, and in Great Britain September 14, 1926.

This invention relates to water-tube boilers for medium or low pressure with highpressure steam-generating elements and its object is to increase the output and the steam pressure thereof. Water-tube boilers with two headers are constructed either with two undivided headers or else with headers subdivided in a vertical direction (sectional boilers).

The invention has for its object to provide a suitable and inexpensive reconstruction of inclined tube boiler of low pressure into a two-pressure boiler by providing therein high pressure elements. A further :5 object of the invention is to increase the economy of the boiler.

The invention is illustrated in the accompanying drawings by way of example as applied to a Babcock and W'ilcox boiler with subdivided headers.

Fig. 1 is a side elevation of a reconstructed boiler,

Fig. 2 a section of the lower end of a front sectional member on an enlarged scale,

Fig. 3 a front elevation according to Fig. 2,

Fig. 4 a side elevation of a boiler with supplementary high-pressure steanrgenerating elements arranged on the under side,

' Fig. 5 shows in front elevation and partly in section the lateral arrangement of supplementary high-pressure steam-generating elements,

Fig. 6 is a section, partly in elevation, taken on the line 6-6 of Fig. 1, and

Fig. 7 is a section, partly in elevation, taken on the line 7-7 of Fig. 4.

From an existing water-tube boiler, of the construction for example of a Babcock and Wilcox boiler with subdivided headers a, a and a drum 6 arranged in the longitudinal direction, the inclined water-tubes are removed. On the outer side of the headers and parallel to the latter, similar headers c, c are arranged which are shown in front elevation in Fig. 3. The front and rear high-pressure sectional members corresponding to one another are connected by l'iighpressure steam-gcnerating elements, (water tubes) (Z. These water tubes pass through the sectional members of the existing boiler and are expanded at the points of contact,

so that they shut off the walls from the exterior in a completely fluid-tight manner. Facing the mouths of the tubes are apertures f in the outer wall of the high-pressure headers, and these are closed in a known manner by joint caps g.

Upper steam drums 7a, 7b arranged in a suitable manner, above the drum Z) for exan ample, are connected by risers 2', z" and by downcomers k, is with the high-pressure headers c, c. For the withdrawal of steam there is provided a steam-collector 1, which is connected with the upper steam drums it, It. The arrangement of the riser tubes is shown in Fig. 6. The drum 2') and the headers a, 0; remain after removing the water tubes of the existing boiler and will be utilized either as an independent low or medium pressure boiler or preferably as a feed heater for the high pressure boiler.

If the existing boiler is utilized as a feed heater, a boiler feed device, not shown, is

arranged between it and the high pressure boiler. Steam can also be taken directly from the existing boiler.

As shown in Fig. l it is possible when converting an existing boiler into a high-pressure boiler to utilize the heat of the hottest gases and to increase the heating surface by ar 'anging supplementary high-pressure steam-generating elements (Z underneath the headers of the existing boiler. The high pressure sectional members 0, c are then correspondingly extended downwards.

Fig. 5 shows in what manner supplementary high-pressure steam-generating elements can be fitted 011 one side, or, in the case of a self-contained or independent boiler, on both sides, by arranging supplementary sectional members suitable for high-pressure steam beside the headers a, a of the existing boiler, and connecting them 5 by supplementary high-pressure steamgenerating elements 65.

I am aware that it has been proposed to provide existing boilers With additional Water tubes, which may be constructed as independent high-pressure boilers, the risers and doWncomers of which are connected to an upper steam drum above the upper steam drum or'drums of the existing boiler, and I Wish it to be understood that the present invention is limited to boilers having high-pressure steam-generating ele ments Which take the place of the Water tubes of the existing boiler.

What I claim is:

1. A Water-tube boiler comprising in combination, headers of an existing boiler for low pressure, a steam and Water drum of said boiler, high-pressure headers arranged parallel to said headers, high pressure steam generating elements connecting the high-pressure headers, the high pressure steam generating elements being provided substantially in the setting of the existing boiler and high pressure steam and Water drums arranged above the loW pressure drum and connected by means of steam tubes to the high pressure headers.

2. A Water tube boiler comprising in combination of headers of an existing boiler for low pressure, a steam and Water drum of said boiler, high pressure headers arranged outside of and parallel to the said headers, high pressure steam generating elements connecting the high pressure headers, the high pressure steamgenerating elements being provided substantially in the setting of the existing boiler, and high pressure steam and Water drums arranged above the low pressure drum and connected by means of steam tubes to the high pressure headers.

3. A Water tube boiler comprising in combination, headers of an existing boiler for low pressure, a steam and Water drum of said boiler, high pressure headers arranged parallel to said headers, high pressure steam generating elements connecting the high pressure headers, the high pressure steam generating elements being provided substantially in the setting of the existing boiler, 55 and high pressure steam and Water drums arranged above the low pressure drum and connected by means of steam tubes to the high pressure headers, the high pressure steam and Water drums being arranged across the axis of the low pressure drum.

4:. A Water boiler comprising in combination, headers of an existing boiler for low pressure, a steam and Water drum of said boiler, high pressure headers arranged outside ofand parallel to the headers, high FRANZ KRUPELIN. 

